As outdoor three-phase AC high-voltage switching device, the ZW8-12 series outdoor vacuum circuit breaker mainly serves in urban and rural power system for rated voltage of 10kV and rated frequency of 50 Hz to make and break load current, overload current and short-circuit current and in the similar occasions as well.
The circuit-breaker is composed of operating device, conductive circuit, insulation system, seal element and enclosure,featuring three-phase shared box style. The conductive circuit is formed by the connection of incoming and outgoing electrodes,conductive plate of moving and fixed terminal, conductive clamp and vacuum arc-extinguishing chamber. The external insulation, is mainly realized by the high voltage bushing, with a capacity of anti-pollution; the inner insulation is the combination type of air and eposy resin. The operating device actu-ates by stored energy operating device with spring. The disconnector also can be fitted in the circuit breaker